Features: case / bezel material: resin resin strap mineral crystal digital display shock resistant electro luminescent backlight afterglow flash alert 1/100-second stopwatch countdown timer multi-function alarm hourly time signal full auto-calendar (to year 2099) 12/24-hour format am/pm display regular timekeeping accuracy: ±15 seconds per month day display solid case back buckle clasp 200m water resistance approximate case diameter: 53.2mm approximate case thickness: 16.3mm